Electric-arc lamp.



No. 650,888. Patented June 5, I900. J. J. WOOD.

ELECTRIC ABE LAMP.

(Application filed Oct. 10, 1899.) (No Model.) 2 Sheats$hao'l l.

WITNESSES:

. INVI:IN%ZI JZZMZ w Wy I By his Alto/ways.

m: Norms PETER; 00., PHOTO L!7HO.. WASHINGTON, D. c.

Np. 650,888. Patented June 5, I900.

, J. J. woon. ELECTRIC ABC LAMP.

(Application filed on. 19, 1899.) (No Model.) 2 'SheetsSheat 2.

FIG, 7.

WITNESSES: INVENTOR:

flu By his 1480;111:313,

W avzm g U ITE STATES PATENT OFFIC JAMES J. WOOD, OF FORT W'AYNE,INDIANA.

ELECTRIC-ARC LAM P.

SPECIFICATION forming part of Letters Patent No. 650,888, dated June 5,1900.

Application filed October 10J 1899. Serial No.- 733i (N0 111 To all whomit may concern:

Be it known that I, JAMES J. Wool), a citizen of the United States,residing at Fort \Vayne, in the county of Allen and State of Indiana,have invented certain new and useful Improvements in Electric-Arc Lamps,of which the following is a specification.

This invention relates principally to focusing-lamps of that characterin which the carbons are arranged vertically beneath the mechanism-case,the lower or negative carbon being carried in a vertically-slidingframe, whichis fed upward at half the speed at which the upper carbon isfed downward.

The preferred construction of my improved lamp is shown in theaccompanying drawings, wherein- Figure 1 is a perspective view of thelamp, showing the globe lowered ready for trimming. Fig. 2 is a verticalmid-section of the lamp at the beginning of its operation, the feedmechanism being omitted. Fig. 3 is a horizontal section on the line 3 3in Fig. 2. Fig. 4 is a perspective view of the portions peculiar to thefocusing-lamp separated from the mechanism-case. Fig. 5 is an enlargeddetail of Fig. 2. Fig. 6 is an enlarged sectional elevation showing oneof the spindles of the focusing-gear in detail. Fig. 7 is a sectionalelevation showing a suitable form of feed mechanism. Fig. 8is'asectional elevation of the lower part of the lamp, showing the globelowered for trimming. Fig. 9 is an elevation of the U-shaped framecarrying the negative carbon detached. Fig. 10 is an enlargedfragmentary elevation, and Fig. 11 is a cross-section of the feed-rodfor the positive carbon.

Let A designate the mechanism-case, which may be of any usualconstruction, and let 13 indicate a U-shaped or drop frame dependingtherefrom for the double purpose of supporting the globe O and ofguiding the frame which carries the negative carbon. 0

D is the positive carbon, and E the negative carbon. The positivecarbonis carried in the usual way by a holder a, fixed on the lower endof a feed-rod F. This feed-rod is actuated by any usual feed mechanismlocated in the mechanism-case A. This mechanism is omitted in'Fig. 2, asit forms no novel part of my invention.

The negative carbon is held in a carbon-holder b and car ried by averticallysliding U-shaped frame G. This frame G is shown separately inFig. 9. It consists of parallel vertical rods 0 c, joined at their lowerends by ayoke d, in the middle of which the carbon-holder b is mounted.The frame G is suitably guided in its vertical sliding movementspreferably by adapting the drop-frame B to act as a guide for it,although other means of guiding may be substituted. The upper ends ofthe side rods 0 c of the frame G may pass up into the mechanism-case A.v

For imparting the requisite feeding movements to the negative carbon theframe G is suitably geared to the feed-rod F. To this end the feed-rod Fis geared or connected by any suitable mechanism to both parallel sidebars 0 c of the frame G in such manner that the movements of thefeed-rod are transmitted equally and simultaneously to both said sidebars. By this means the weight of the lower carbon and itscarrying-frame G is balanced and transmitted symmetrically to thefeed-rod, so that there is no tendency to tilt or cant the sliding frameor bind the feed-rod. The gearing for this purpose may be variouslyarranged, but I prefer the system shown wherein the feed-rod F is formedwith rack teeth 6 6, cut into it at opposite sides, meshing with gearwheels or pinions ff, fixed on obliquely-arranged horizontal shafts orspindles g 9, arranged in the manner clearly shown in Figs. 3 and 4,while on, the opposite ends of these spindles are formed pinions h h,hav ing approximately half the diameter of the pinions f and meshingwith racks cut in the side bars 0 c of the frame G. The spindles g g areinclined, so that the pinion f shall en gage the feed-rod on one side ofthe axis, while the pinion it engages the frame G on the opposite sidethereof, in order to reverse the di rection of feeding movement. Itresults'from this arrangement that the downward-feeding movement of thefeed-rod F, which carries down the positive carbon, causes an upwardfeeding movement at half-speed ofthe two side bars 0 o, and hence of thenegative carbon E.

I will now describe the details of construc tion which I prefer toemploy.

Beneath the bottom plate 13 of the mcchau ism-ease is fastened a plateor casting H, (shown clearly in Fig. 4,) being insulated from the platet' by a disk or ring j, of insulating material. The plate II is formedwith a depression H, forming a chamber for inclosing thefocusing-gearing, as clearly shown in Fig. 4. The plate II is formed onopposite sides with deep tubular bosses 70, into which are screwed twoupright tubes Z Z, which form the side bars or members of the drop-frameB. In order that the drop-frame B may serve as the guide for the slidingframe G, its side bars Z Z are formed as tubes having a free fit withthe bars or rods 0 c, which pass through them. In order to admit of thevertical movement of the yoke d, the tubes l are vertically slotted attheir lower portions at Z. The lower ends of the tubes Z are closed byscrew-plugs m, screwed into them, as shown in Fig. 5. 1nasmueh as thetubes are slotted entirely to their lower ends in order to admit theinsertion of the frame G, it becomes necessary to provide some means forpreventing spreading of their open or slotted ends, and for this purpose1 construct the plugs m each with an upwardly-projecting flange m,having a coned inner face adapted when screwed up to draw in the lowerend of the tube, which is preferably also coned. The plug m has adownwardly-projecting neck or stud m for attaching the ends of the yoke02, which forms the bottom portion of the drop-frame B. It is desirableto insulate this yoke from the tubes Z Z,'whieh are not insulated fromthe negativecarbon holder, and to this end I interpose insulating-bushin gs between the plugs m m and yoke it. These details ofconstruction are best shown in Fig. 5. The plate II and the side bars ortubes Z 1 form part of the negative circuit, and hence the feed-rod Frequires to be insulated from the plate II, for which purpose and toguide and steady the lower end of the feed-rod I provide an insulatedbushing 0, which is fastened beneath the plate H and insulated therefromby an interposed insulating-washer. In constructing the frame G thelower ends of the rods or side bars 0 c are riveted into the ends of thecross-piece or yoke (Z.

In order to use a full-length carbon with out having the light too highin theglobe, the yokes n and d are made lower at the center than at theends, as shown.

The plate II by reason of its depression 11 forms a dust-proof chamberfor inclosin g the focusing-gearing and serves as a convenient mountingfor such gearing. For each of the spindles g a bearing-boss Q) isprovided at one end, while at the other a screw-plugp is provided,which, screwing into the plate II, as shown in Fig. 6, forms a bearingfor the op posite end or journal of the spindle. By unscrewing orloosening the plugs 11 until the inner ends of the shafts are free fromthe bosses p the shafts can be lifted out. has much as the pinionsfarein metallic contact with the positive feed-rod F while the pinions 7tare in metallic contact with the side bars 0 of the negative frame, itis obvious that these respective pinions must be insulated from oneanother. This I preferably accomplish by interposing aninsulating-bushingf, Fig. 6, of mica or other suitable material, betweenthe pinionsf and the spindle g.

The globe C is fastened at its lower part to a globe-holder or cup g,which hooks upon the yoke n by means of hooks r, projecting up withinthe globe and hooking over this yoke by a quarter-turn, as heretoforeconstructed.

To lower the globe for trimming, it is only necessary to slightly liftthe cup q, give it a quarter-turn backward to release the hooks r, andthen lower it. Ileretofore the globe has usually been entirely removedfrom the lamp during trimming. My present construction, however,provides for suspending the globe during trimming in the position shownin Figs. 1 and 8. To this end I provide chains or other flexibleconnectors s s, fastened at their lower ends to the cup 1 and havingrings or links at their upper ends which hook over hooks 751 formed onthe yoke a. In raising the globe into position after trimming the chains.5 .9 simply fall into the hollow of the on p (1 out of the way. Theglobe is ventilated by a central aperture in the cup, as heretofore.

The mechanism-ease A is formed or inelosed in the usual manner by meansof a sheetmetal cylindera, which is insulated from the plates 2' and IIby the protrusion of the intervening insulating-disk j, which is made oflarger diameter. The shellu has a downward prolongation a extendingconsiderably beneath the plate II. A sheet-metal shell or hood '0 isarranged to form a downward continuation of the shell a and has anenlarged boss which when the lamp is in use rests against the upper partof the globe. In trimming the lamp, however, it is desirable to raisethis shell r in order to enable the operator to more readily reach thepositive-carbon clamp a, and to this end the shell v is made totelescope upon the portion a of the upper shell. To this end it is madeto fit over it, and to limit its movement it has studs 0' at oppositesides, which work in long vertical slots at in the shell to. Fig. 1shows the lower hood e raised for trimming. The upper shell 10 has askirt 24 which passes outside of the upper edge of the shell a: in orderto shed rain. Ventilation is provided for by means of holes near thebase of the shell 1: and through the lower shell u, the air passing intothe mechanismcase threugh holes y, Fig. 4-, in the plate H and escapingfrom the top by the usual open- 11] gs.

Although, as before stated, the particular kind or type of feedmechanism used is immaterial to my present invention, yet as an exampleof a suitable mechanism Ihave shown in Fig. 7 a feed mechanism of theclutch-feed type. J and K are regulatingmagnets or solenoids, the formerbeing wound with coarse wire and connected serially, as the main mag:net, and the latter wound with fine wire and connected in a shunt aroundthe are, as the shunt-magnet. They act oppositely upon the armature orsolenoid core L, which is hung upon an armature-lever M, pivoted at l\!'and receiving the tension of an adjustable retractile spring N. A linkconnects the lever M to the clutch-lever P, which carries the shoe P ofthe clutch, being pivoted to a clutch-sleeve Q, which is mounted tofreely embrace the feed-rod F. The tail P of the clutch-lever is engagedby a stop B. When the shunt-magnet K draws down the armature-lever M, itlowers the clutch and rod until the tail of the clutch-lever is arrestedat the stop R, whereupon any further downward movement opens the clutchand permits the feed-rod to slide through it. For a further descriptionand illustration of a clutchfeed mechanism of this type I will refer tomy Letters Patent No. 487,315, of December 6, 1892. It will beunderstood that the clutch sleeve Q and shoe P bear against the smoothportions of the rod F between the rack-teeth, so that the latter do notinterfere with the action of the clutch. The feed-rod F feeds down bygravity when released, being made sufficient] y heavy so that,considering its advantage of leverage, it outweighs to a suitable extentthe negative-carbon frame G.

In order to make good electrical connections with the feed-rod F andwith the negative frame G, I provide the usual contacting spring y,mounted on the mechanism-frame and hearing at its free end upon thefeed-rod F, and I provide similar springs y y, (shown in Figs. 3 and 6,)mounted within the chamber H of the plate II and bearing at their upperends upon the vertical side rods 0 c.

It will be understood that my invention is not limited to the severaldetails of. construction set forth and specifically that it is notlimited. to the employment of any particular feed nor to the use of aclutch-feed, nor am I limited to the particular arrangement of focusing-gearin g shown and described,although this arrangement is consideredpreferable.

I claim as my invention the following-defined novel features,substantially as hereinbefore specified, namely:

1. In a focusing arc-lamp, the combination of a feed-rod for thepositive carbon formed with rack-teeth, a U-shaped sliding framecarrying the negative carbon, the legs of said frame formed as rackbars, and reducing spur-gearing interposed between said feedrod and saidrack-bars for imparting feed movements to the negative carbon.

2. In a focusing arc-lamp, the combination of a feed-rod for thepositive carbon formed with rack-teeth on opposite sides, a U shapedsliding frame carrying the negative carbon, its legs formed withrack-bars, and interposed 4. In a focusing arc-lamp, the combination ofa mechanism-case, a feed-rod for the positive carbon, a U-shaped slidingframe carrying the negative carbon, gearing interposed between saidfeedrod and both legs of said frame, and a separate gear-chamberinclosing said gearing.

5. In a focusing arc-lamp, the combinationof a mechanism-case, afeed-rod for the positive carbon, a U-shaped sliding frame carrying thenegative carbon, gearing interposed between said feed-rod and both legsof said frame, and achamber formed beneath the mechanism-case andinclosing said gearing.

6. In a focusing arc-lamp, the combination of a mechanism-case, afeed-rod for the positive carbon, a U-shaped sliding frame carry ing thenegative carbon, gearing interposed between said feed-rod and both legsof said frame, and a chamber inclosing said gearing, said gearingcomprising spindlesg g, and said chamber formed with bearing-lugs p p,and with opposite adjustable bearing-plugs p 19' for mounting saidspindles.

7. In a focusing arc-lamp, the combination of a mechanism-case, aninsulated plate fastened beneath said case, a drop-frame sup-' portedfrom said plate, a feed-rod for the positive carbon, a U-shapedslidingframe carrying the negative carbon, and gearing interposedbetween said feed-rod and sliding frame for imparting feed movements tothe latter, and said insulated plate formed to constitute a chamberinclosing said gearing.

8. In a focusing arc-lamp, the combination of a mechanism-case, adrop-frame comprising parallel upright tubes Z Z having slots in theirlower port-ions, plugs at closing the lower ends of said tubes andholding the sides of said tubes inward so as to prevent spreading, and ayoke 'n uniting said tubes and fastened to said plugs, and a U-shapedsliding frame for the negative carbon comprising side bars 0 c slidingin said tubes, and a bottom yoke d connecting their lower ends andmoving in said slots.

9. In a focusing arc-lamp, the combination of a mechanism-case, adrop-frame compris ing parallel upright tubes Z Z having slots in theirlower portions, screw-plugs m screwing into the bottom ends of saidtubes and hav In witness whereof I have hereunto signed ing conicalflanges m for preventing said my name inthe presence of two subscribingslotted ends from spreading, and a yoke n uniting said tubes andfastened to said plugs, witnesses. and a U-shaped sliding frame for thenega- JAMES J. WOOD. tive carbon comprising side bars 0 a slidingW'itnesses: in said tubes, and a bottom yoke 01 conneot- L. S. NOLD,

D. O. DAVIS.

ing their lower ends and moving in said slots.

